This can go one of meny different ways....depending on what you can find. Here are a few suggestions:
1) Get a pair of boots and cut the upper toe off then soe the toe loop
2) Find a pair of black sandles and sew on pleather for the rest of the covering
3) Make the shoe yourself out of pleather and hard plastic/foam

Remember, comfort really needs to be there, otherwise you'll never do this again.